17 lines
431 B
Python
17 lines
431 B
Python
import re
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import stdnum.isbn
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def normalize_isbn(value):
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return ''.join([s for s in value if s.isdigit() or s == 'X'])
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def find_isbns(text):
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matches = re.compile('\d[\d\-X\ ]+').findall(text)
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matches = [normalize_isbn(value) for value in matches]
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return [isbn for isbn in matches if stdnum.isbn.is_valid(isbn)
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and len(isbn) in (10, 13)
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and isbn not in (
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'0' * 10,
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'0' * 13,
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)]
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